Remove ami support #8252

Job	Run time
e2e_pre_etna	11m 55s
e2e_post_etna	11m 4s
Unit (macos-12)	6m 58s
Unit (ubuntu-20.04)	2m 59s
Protobuf Lint	6s
e2e_existing_network	4m 18s
Unit (ubuntu-22.04)	6m 49s
Fuzz	14m 18s
Unit (ubuntu-24.04)	3m 3s
Unit (windows-2022)	10m 2s
Lint	3m 14s
Unit (custom-arm64-jammy)	12m 2s
Upgrade	3m 20s
Unit (custom-arm64-noble)	12m 46s
Up-to-date protobuf	27s
Up-to-date mocks	2m 1s
Up-to-date go.mod and go.sum	13s
Build Antithesis avalanchego images	8m 24s
Build Antithesis xsvm images	11m 50s
Image build	10m 38s
	2h 16m 27s

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